/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.core;

import java.sql.CallableStatement;
import java.sql.SQLException;

import org.springframework.lang.Nullable;

Interface to be implemented for retrieving values for more complex database-specific types not supported by the standard CallableStatement.getObject method. 
Implementations perform the actual work of getting the actual values. They must implement the callback method getTypeValue which can throw SQLExceptions that will be caught and translated by the calling code. This callback method has access to the underlying Connection via the given CallableStatement object, if that should be needed to create any database-specific objects. 
Author:
Thomas Risberg
See Also:
Types
CallableStatement.getObject
StoredProcedure.execute(Map<String,?>)
Since:
1.1/**
 * Interface to be implemented for retrieving values for more complex database-specific
 * types not supported by the standard {@code CallableStatement.getObject} method.
 *
 * <p>Implementations perform the actual work of getting the actual values. They must
 * implement the callback method {@code getTypeValue} which can throw SQLExceptions
 * that will be caught and translated by the calling code. This callback method has
 * access to the underlying Connection via the given CallableStatement object, if that
 * should be needed to create any database-specific objects.
 *
 * @author Thomas Risberg
 * @since 1.1
 * @see java.sql.Types
 * @see java.sql.CallableStatement#getObject
 * @see org.springframework.jdbc.object.StoredProcedure#execute(java.util.Map)
 */
public interface SqlReturnType {

	
Constant that indicates an unknown (or unspecified) SQL type.
Passed into setTypeValue if the original operation method does
not specify a SQL type.
See Also:
Types
JdbcOperations.update(String, Object[])/**
	 * Constant that indicates an unknown (or unspecified) SQL type.
	 * Passed into setTypeValue if the original operation method does
	 * not specify a SQL type.
	 * @see java.sql.Types
	 * @see JdbcOperations#update(String, Object[])
	 */
	int TYPE_UNKNOWN = Integer.MIN_VALUE;


	
Get the type value from the specific object.
Params:
cs – the CallableStatement to operate on
paramIndex – the index of the parameter for which we need to set the value
sqlType – the SQL type of the parameter we are setting
typeName – the type name of the parameter (optional)
Throws:
SQLException – if a SQLException is encountered setting parameter values
(that is, there's no need to catch SQLException)
See Also:
Types
CallableStatement.getObject
Returns:
the target value/**
	 * Get the type value from the specific object.
	 * @param cs the CallableStatement to operate on
	 * @param paramIndex the index of the parameter for which we need to set the value
	 * @param sqlType the SQL type of the parameter we are setting
	 * @param typeName the type name of the parameter (optional)
	 * @return the target value
	 * @throws SQLException if a SQLException is encountered setting parameter values
	 * (that is, there's no need to catch SQLException)
	 * @see java.sql.Types
	 * @see java.sql.CallableStatement#getObject
	 */
	Object getTypeValue(CallableStatement cs, int paramIndex, int sqlType, @Nullable  String typeName)
			throws SQLException;

}